Online heating system control project

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online heating system control project

=version C - no more String class, everything indexed on MAXCKTS, new setpts in (simple)<JSONarray>

setup() starts the serial monitor and ethernet then reads from memory an array of sensor id's (char lu[MAXCKTS][9]), the numckts and an array of setpts[MAXCKTS] where 12 is MAXCKTS. It then assigns an array of pins as outputs (to relays not yet arrived from China)

The main loop() begins zipping along taking in a character of incoming data on each loop and printing it to the serial monitor while grabbing characters if they come between < and > and storing them in a character array cdata[]

updateSetpts() then kicks in, first reading current setpt[] data from memory, and, as long as some data has come (strlen(cdata)-2>4) it loads up ps[] from cdata[] with everything inside <[]>. This incoming dat must be in the form <[0,0,0,0,0,0,0,0,0,167,0,0]> with MAXCKTS entries.

strtok then breaks up that ps[] character array on the ',' and puts each setpt in an array of char arrays *strings[pslen] which gets indexed for each of the MAXCKTS setpt values coming in. Each is then atoi'd into an integer newVal which is compared with curVal and if(curVal != newVal && newVal > 0){ //not equal to each other and newVal isn't 0, then the newVal is written to memory and replaces the curVal.

   cdata[0]='\0';
   getSensorIds();
   readTemps();
   orderTemps();    
   setRelays(); 
   assembleData();
   sendData(); 
   lastConnectionTime = millis();  

Next: only record to db if temp changes

in c://Users/tim/Documents/tech/electronics/Arduino/hsc_run.ino

in c://Users/tim/Documents/tech/electronics/Arduino/hsc_setup.ino

in c://Users/tim/Documents/tech/electronics/Arduino/hsc_readSetup.ino

version A - mega as server sending to ReSt API and client receiving new setpts

in c://Users/tim/Documents/tech/electronics/Arduino/thermoc.ino

bits and pieces

version 6

Moving things to 10.0.1.101 but first set up api framework there
Added rewrite rules in /etc/apache2/sites-available/default by following beginner link <syntaxhighlight> <Directory /var/www/hsc> RewriteEngine On RewriteRule feed/([0-9]+) /var/www/hsc/index.php?id=$1 RewriteRule feeds /var/www/hsc/index.php RewriteRule datastreams /var/www/hsc/index.php?id=$1 RewriteRule prog /var/www/hsc/index.php?id=$1 RewriteRule progs /var/www/hsc/index.php?id=$1 </Directory> </syntaxhighlight> Test code to parse url <syntaxhighlight> <?php echo("hi dog
"); print_r($_SERVER['REQUEST_URI']); echo "
"; $urlarr = (parse_url($_SERVER['REQUEST_URI'])); echo "
"; print_r($_GET); echo "
"; print_r($urlarr); echo "
"; $pathstr=($urlarr["path"]); echo $pathstr; echo "
"; print_r(explode("/", $pathstr)); ?> </syntaxhighlight>

version 3

php www-data program that creates a crontab and calls a C program that executes root commands to copy it into crontabs and install it

write a php file that PUTS some light on on the AVR

collect data from AVR and store it in mysql

view the saved data on a client using javascript

code working on arduino

raw DS18B20 to server, convert and send back to serial monitor

Uploaded to Arduino is hsc_tempJSONphp.ino Raw data is sent by arduino to /var/www/feeds/getnoise.php which puts it in an object and then creates another object containing F converted sensor readings for data coming off ONEWIRE connected sensors. Then it sends that data back.

Trying to convert to float on the Arduino wasn't working. Why push it? I've got unlimited power on LAMP server.

version 4 - temp readings beyond serial monitor

version 4b - JSON from arduino to PHP server

a) separate out a function to provide a reading to send to cosm for pin 0(14) and 1(15)

1 one possibility - send to cosm. This is better than having a webclient like thermometer.ino. Get it to Cosm and then later set up an api like cosm

version 3 - onewire demo

Put sample code in function getTemp(). Subsequent calls of the function don't reset the device counter. this is good.

On serial monitor running DS18x20_Temperature.ino ala the library here. Of note: How it polls each device: <syntaxhighlight>

 if ( !ds.search(addr)) {//this is where it loops to the next address
   Serial.println("No more addresses.");
   Serial.println();
   ds.reset_search();//if there are no more devices go back to start of list
   delay(250);
   return;
 }

</syntaxhighlight>

version 2

Online thermometer creating web page in which you call for the data by clicking a button. Uses design from Practical Arduino in /tim/Documents/electronics/arduino/thermometerthermometer.ino and it runs at http://10.0.1.79

version 1

Take random readings from analog pins start an etehrnet client that sends them out to http://cosm.com (mcktimo 6j) every ten seconds :comtest.ino

final narrative

An Avr takes in temperature readings from multiple locations. At the control room the AVR hub polls temperature and for each zone knows the set temperature, the default temperature and whether or not a zone is ON and how long it has been on. If it doesn't hear from the (linux) scheduler then it falls back to act as a multi-zone thermostat set at the default temperatures. Through a rudimentary display it would allow you to set temperatures for each zone.

The scheduler would take temperature data from the AVR client and would know the schedule. Whenever a schedule change point would come up, it would notify the AVR and instruct it to change the set point. It would do this via chrontab maybe.

The controller would on the client probably an HTML5/javascript client. Here you can read the temperatures and view the schedule. You can override or change the schedule.

possible routes

A cheap circuit like http://www.craig.copperleife.com/tech/thermo/ or more complicated http://www.rentron.com/project01.htm using http://datasheets.maximintegrated.com/en/ds/DS1620.pdf which can be overridden by server program that controls multiple thermostats.

ReST

Angular and PHP

Apache setup

Add rewrite rules

so a restful path /hsc/feeds/1234 (which doesn't really exist) sends you to the API which processes the request using the /feeds/12345 information from the path.

In /etc/apache2/sites-available/default add rules like <syntaxhighlight lang="html5"> <Directory /var/www/hsc> RewriteEngine On RewriteRule feed/([0-9]+) /var/www/hsc/index.php?id=$1 RewriteRule feeds /var/www/hsc/index.php RewriteRule datastreams /var/www/hsc/index.php?id=$1 RewriteRule prog /var/www/hsc/index.php?id=$1 RewriteRule progs /var/www/hsc/index.php?id=$1 </Directory> remember to restart apache /usr/sbin/apache2ctl restart </syntaxhighlight> The API processing code resides in /hsc in this case.

when to GET PUT POST

GET when you want some data

PUT when you've got data to put in the API

POST when you want to setup something new

DELETE duh

In the case of home_system_control (hsc):

• GET request to /api/users – List all users
• GET request to /api/users/1 – List info for user with ID of 1
• POST request to /api/users – Create a new user
• PUT request to /api/users/1 – Update user with ID of 1
• DELETE request to /api/users/1 – Delete user with ID of 1

refs

cosm curl helper

http://api.cosm.com/v2/feeds/83080/datastreams/noise.csv?start=2013-01-11T19:30:00Z&end=2013-01-11T21:00:00Z&interval=0 doesn't work

http://cosm.github.com/cosm-js/tutorial/

accessing-incoming-put-data-from-php

create-a-rest-api-with-php

http://rest.elkstein.org/2008/02/using-rest-in-php.html

http://blog.garethj.com/2009/02/17/building-a-restful-web-application-with-php/

get for my feed

making-reliable-connections-with-arduino

Cron Jobs

Hudsonvalley#cron_and_backups

http://net.tutsplus.com/tutorials/php/managing-cron-jobs-with-php-2/

http://stackoverflow.com/questions/4421020/use-php-to-create-edit-and-delete-crontab-jobs

parts

DS1620 Digital Thermometer and Thermostat

In a thermostat circuit $2.20 for dip

DS18B20 Maxim 1-wire temperature sensors

DS18B20 datasheet$1.00 each for chip, $3.00 each for waterproof sensor

one-wire protocol

https://arduino-info.wikispaces.com/Brick-Temperature-DS18B20 multiple

OneWire tutorial another better library

color code for encased DS18B20 sensor red=vcc,black=gnd,yellow=data